diff --git a/src/pocketmine/Server.php b/src/pocketmine/Server.php
index 537f9ff479..ac9e10aad2 100644
--- a/src/pocketmine/Server.php
+++ b/src/pocketmine/Server.php
@@ -366,6 +366,9 @@ class Server{
 		return $this->getConfigString("server-ip", "0.0.0.0");
 	}
 
+	/**
+	 * @return UUID
+	 */
 	public function getServerUniqueId(){
 		return $this->serverID;
 	}
diff --git a/src/pocketmine/entity/Human.php b/src/pocketmine/entity/Human.php
index 1576bf9ffb..855fd8afef 100644
--- a/src/pocketmine/entity/Human.php
+++ b/src/pocketmine/entity/Human.php
@@ -293,7 +293,7 @@ class Human extends Creature implements ProjectileSource, InventoryHolder{
 				$this->setSkin($this->namedtag->Skin["Data"], $this->namedtag->Skin["Name"]);
 			}
 
-			$this->uuid = UUID::fromData($this->getId(), $this->getSkinData(), $this->getNameTag());
+			$this->uuid = UUID::fromData((string) $this->getId(), $this->getSkinData(), $this->getNameTag());
 		}
 
 		if(isset($this->namedtag->Inventory) and $this->namedtag->Inventory instanceof ListTag){
diff --git a/src/pocketmine/inventory/CraftingManager.php b/src/pocketmine/inventory/CraftingManager.php
index 99aba153cd..95fd1cced3 100644
--- a/src/pocketmine/inventory/CraftingManager.php
+++ b/src/pocketmine/inventory/CraftingManager.php
@@ -297,7 +297,7 @@ class CraftingManager{
 	 * @param Recipe $recipe
 	 */
 	public function registerRecipe(Recipe $recipe){
-		$recipe->setId(UUID::fromData(++self::$RECIPE_COUNT, $recipe->getResult()->getId(), $recipe->getResult()->getDamage(), $recipe->getResult()->getCount(), $recipe->getResult()->getCompoundTag()));
+		$recipe->setId(UUID::fromData((string) ++self::$RECIPE_COUNT, (string) $recipe->getResult()->getId(), (string) $recipe->getResult()->getDamage(), (string) $recipe->getResult()->getCount(), $recipe->getResult()->getCompoundTag()));
 
 		if($recipe instanceof ShapedRecipe){
 			$this->registerShapedRecipe($recipe);
diff --git a/src/pocketmine/scheduler/SendUsageTask.php b/src/pocketmine/scheduler/SendUsageTask.php
index c8df78e998..a8eb9e25ee 100644
--- a/src/pocketmine/scheduler/SendUsageTask.php
+++ b/src/pocketmine/scheduler/SendUsageTask.php
@@ -44,7 +44,7 @@ class SendUsageTask extends AsyncTask{
 		$data = [];
 		$data["uniqueServerId"] = $server->getServerUniqueId()->toString();
 		$data["uniqueMachineId"] = Utils::getMachineUniqueId()->toString();
-		$data["uniqueRequestId"] = UUID::fromData($server->getServerUniqueId(), microtime(true))->toString();
+		$data["uniqueRequestId"] = UUID::fromData($server->getServerUniqueId()->toString(), microtime(false))->toString();
 
 		switch($type){
 			case self::TYPE_OPEN: